Printing ink heater



FIG. 1 is a front perspective view of a printing ink heater showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The dotted line showing of electrical heating cords are for illustrative purposes and form no part of the claimed design. 

The ornamental design for a printing ink heater, as shown and described. 